base-value

Arguments: bar-chart-view

Returns the value of the base-value property of a bar-chart-view. The value may be set at creation time by passing the base-value initarg, or any time later by calling (setf base-value).

The default value for the start of each bar in bar-chart-view in a chart-widget. The value should be a real number. The default value is zero.

Each bar in a bar-chart-view starts at one value on the value-axis and ends at another value. The ending value of a bar is always the main data value for a chart item / chart object pairing that a single bar represents. A "main data value" is the one that is passed as the value argument to set-chart-value or returned from a chart-value-returner function when the value-type argument is :value. The starting value of a bar will be the from-value if one was supplied for the bar, and otherwise it will default to the base-value of the bar-chart-view. The base-value defaults to zero, so every bar by default will start at zero on the value-axis and end at the main value for the bar.

See chart-widget and also cg-chart-widget.htm.

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This page was not revised from the 9.0 page.
Created 2015.5.21.